CSCAMP CTF Quals 2013 - Reverse 150 write-up

In this task we are given a x86-64 binary that prints a string.

Sharif CTF Quals 2013 - Exploiting 100 - mellow

Task:

nc ctf.sharif.edu 61451

Download

We have a simple service that accepts our input and if it doesn't allow us to get a flag it shutdowns the connection.

Sharif CTF Quals 2013 - Reverse 300 - HelpMe

Task:

Download

We are provided with a Java archive (jar) that can be used to encrypt a file using an AES block cipher.

Sharif CTF Quals 2013 - Reverse 200 - Reverse200

Task:

Download

We are provided with an x86 ELF executable that crashes while trying to decrypt a key.

Sharif CTF Quals 2013 - Reverse 100 - Vault

Task:

Download

In this task we have to open a huge lock. We are provided with .NET binary and the task is the same as usual: get a flag!

Sharif CTF Quals 2013 - Steganography 200 - muse

Task:

Another hidden message!

Download

 We are provided with the mp3 "Knights of Cydonia" song by Muse. This container should have something hidden, therefore it is task on audio steganography topic, let's capture the flag.

CSAW CTF Quals 2013 - Reverse 500 - Impossible

Task:

Impossible - 500 Points

Solved by 82 teams.

WTF, his hp is over 9000! Beat the game to get your key.
impossible.nds

In this task we are provided with an image of the Nintendo DS cartridge with a game. The task clearly says we have to win probably cheating. Firstly I installed IDA loader for .nds files (You can find it in the net) but this haven't helped me a lot: there were a lot of ARM code and no clues how to get to the flag.

CSAW CTF Quals 2013 - Reverse 400 - keygenme

Task:

keygenme - 400 Points

Solved by 100 teams.

nc 128.238.66.219 14549
keygenme32.elf

We are given a x86 ELF executable. It takes 3 arguments(username, token1, token2) and prints whether they are good(*<:-)) or not. ( :-( ). In this task we need to write a keygen that will communicate with judges server, which sends username to keygen, and then send them valid token pair for each username.

ASIS CTF 2013 - Reverse 200 - Masterpiece

Task:

file

ASIS CTF 2013 - Forensics 100 - pcap

Task:

Find the flag. file

You can download the missing parts of pcap forensic challenge from here:
053dc897d3e154dd5ed27c46b738850d
21eae902cf5b82c7b207e963a130856d

ASIS CTF 2013 - Forensics 75 - rm-rf

Task:

We have received a usb flash backup. Which file the flag is in?
file

ASIS CTF 2013 - Forensics 25 - spcap

Task:

spcap = simple pcap
Find the flag. flag

ASIS CTF 2013 - Reverse 150 - License Key

Task:

Find the flag. file

ASIS CTF 2013 - Reverse 100 - RPS

Task:

Play Rock-Paper-Scissors game with dice! file

ASIS CTF 2013 - Reverse 75 - Serial Number

Task:

Enter the correct serial number file.

ASIS CTF 2013 - Reverse 50 - Simple Binary

In "Simple binary" task teams were provided a MS-DOS binary that asked for 6 numbers.

ASIS CTF 2013 - Stego 50 - Fragmentation

In the first stegano task there was given a picture of a class board. As the task title says the flag is probably split into couple of fragments.

Task